Ricoh / Pentax K-S1

Ricoh / Pentax K-S1 firmware

Ricoh / Pentax · K-S1 · Body

Latest firmware for the Ricoh / Pentax K-S1 is v1.20.

K-S1 specifications

Body type
Mid Size SLR
Resolution
20.1 MP
Sensor
CMOS
Sensor size
23.5 × 15.6 mm
Processor
Prime MII
ISO range
100–102400
Fastest shutter
1/6000
Burst rate
5.4 fps
Battery life
410 shots (CIPA)
Storage
SD/SDHC/SDXC
Video
H.264
Mount
Pentax KAF2
Weight
558 g
Dimensions
121 × 93 × 70 mm
Weather sealed
No
Price at launch
$749

K-S1 firmware changelog

  1. v1.20 first tracked

Firmware history

  1. Version 1.20 Latest First seen Jul 4, 2026
    Show release notes

    Corresponded to [KAF4 lens mount] that is equipped with an electrom​agnetic diaphragm control system. Enable new lens HD PENTAX-DA 55-300mmF​4.5-6.3ED PLM WR RE to shoot stable by updating firmware. Improved stability for general performance.

    Release notes & download

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